It was Mexicans too. It's where the "lazy Mexican sleeping in the shade" comes from.
If you're willing to question cannabis legality maybe look at other drugs too. Coca leaves were chewed by native tribes millennia ago to help with long journeys. Kratom was used in Asia to help with long harvest days. Celts were eating shrooms millennia ago.
Humanity has a LONG history of drug use with nothing off-limits and there was no societal collapse from it. It's the past century puritan ideals that are a serious aberration.
Did you know it's statistically more dangerous to go horse riding than take Molly? The toilets in the UK Parliament were tested for cocaine and all tested positive. No drug should be illegal.